and struck the back of the Ravenswood train. This impact was at , as the train had only started off a few seconds earlier and was still halfway through pulling out of Randolph/Wabash. Passengers on the train reported the impact as nothing more than a "quiet thump." However, after the impact motorman Stephan A. Martin continued to apply traction power. This resulted in the rear cars continuing to push forwards, pinning the front of the train against the waiting Ravenswood on the right-angle turn of the track. With the front Lake–Dan Ryan train unable to move forward, the pressure from behind caused the coupling bar between the first two cars to bend and the coupled ends of those two cars to be pushed in the air. As motor power continued to be applied, the first three cars (two Budd 2200 units and a single Pullman-Standard 2000) were pushed further upwards, until they jackknifed and fell off the tracks. The second and third cars fell all the way to the street below, while the first car fell onto a track support structure. The fourth car (another 2000 connected to the third car), pulled forward by the third, was derailed and dangled between the track edge and surface street. The last four cars remained on the track and still in Randolph/Wabash station. Investigation and CTA response While "traces of THC" were found in one urine sample, "the extent to which [Martin] may have been under the influence of marijuana at the time of the accident could not be determined by tests." Subsequent investigation revealed that Martin had a poor safety record, including reading while operating the train, and was responsible for an earlier derailment, and he had a tendency to talk to passengers while driving the train. It is theorized that, having made the normal station stop before the curve, Martin had caused the restrictive cab signal caused by the train ahead to be overridden. Distracted, he then left the station at under , which was slow enough not to trigger the automatic control, and then after the initial collision, panic or inertia caused him to move the Cineston controller forward resulting in the derailment. As a result of the accident, the CTA forbade motormen to proceed past a red signal "on sight" without first getting permission from the Control Center. 2200 units 2289-2290 and 2000 units 2043-2044 were wrecked beyond repair